Sources and Processes Affecting Nitrate in a Dam-Controlled Subtropical River, Southwest China

Li, Xiaodong; Liu, Cong‐Qiang; Liu, Xiaolong; Jian, Yu; Liu, Xueyan

doi:10.1007/s10498-014-9231-1

Cited by 14 publications

(2 citation statements)

References 50 publications

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“…For the nitrogen fertilizer source, the ln(RR) value in the non-complex urban and rural areas was 0.19, higher than that of the complex urban and rural areas. Thus, these two landuse types, nitrogen fertilizer was the primary source in non-complex urban and rural areas due to advanced agricultural systems in these areas (Li et al, 2014b;Peters et al, 2019). For the soil nitrogen source, the ln(RR) value in the complex urban and rural areas was 0.34, higher than that of the non-complex urban and rural areas.…”

Section: Comparison Of the Nitrate Source With Other Twenty-five Similar Watershedsmentioning

confidence: 99%

Contribution of Nitrogen Sources to Streams in Mixed-use Watershed Varies Seasonally in a Temperate Region

Lin

Liu

Xiao

et al. 2021

Preprint

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The Beiyun river flows through a hot spot region of Beijing-Tianjin-Hebei in China that serves a majority of occupants. However, the region experiences severe nitrate pollution, posing a threat to human health due to inadequate self-purification capacity. In that context, there is an urgent need to assess nitrate levels in this region. Herein, we used δ15N-NO3, δ18O-NO3 isotopes analysis, and stable isotope analysis model to evaluate the nitrate source apportionment in the Beiyun river. A meta-analysis was then used to compare the potential similarity of nitrate sources among the Beiyun riverine watershed and other watersheds. Results of nitrate source apportionment revealed that nitrate originated from the manure & sewage (contribution rate: 89.6%), soil nitrogen (5.9%), and nitrogen fertilizer (3.9%) in the wet season. While in the dry season, nitrate mainly originated from manure & sewage (91.6%). Further, different land-use types exhibited distinct nitrate compositions. Nitrate in urban and suburban areas mostly was traced from manure & sewage (90.5% and 78.8%, respectively). Notably, the different nitrate contribution in the rural-urban fringe and plant-covered areas were manure & sewage (44.3% and 32.8%), soil nitrogen (26.9% and 35.7%), nitrogen fertilizer (23.5% and 29.4%), and atmospheric deposition (5.3% and 2.0%). Through a meta-analysis, we found nitrogen fertilizer, soil nitrogen, and manure & sewage as the main nitrate sources in the Beiyun riverine watershed or the other similar complex watersheds in the temperate. Thus, this study provides a scientific basis for nitrate source apportionment and nitrate preventive management in watersheds with complex land-use types in temperate regions.

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Section: Comparison Of the Nitrate Source With Other Twenty-five Similar Watershedsmentioning

confidence: 99%

Contribution of Nitrogen Sources to Streams in Mixed-use Watershed Varies Seasonally in a Temperate Region

Lin

Liu

Xiao

et al. 2021

Preprint

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“…In order to analysis longitudinal variation of [DIN] in CRN, data from annual hydrological reports from 1970 to 1985 (China, 1970(China, -2012 and public literature from 1999 to 2012 (Han and Liu, 2004;Chetelat et al, 2008;Li et al, 2008;Wu et al, 2008;Li et al, 2009;Wang and Wang, 2009;Han et al, 2010;Lu et al, 2011;Xu et al, 2011;Zheng et al, 2011;Ji and Jiang, 2012;Jiang et al, 2012;Yan et al, 2012;Liu et al, 2013;Sun et al, 2013;Wu et al, 2013;Han et al, 2014;Li et al, 2014a;Li et al, 2014b;Luo et al, 2014;An et al, 2015;Qu et al, 2015;Wang et al, 2015a) within the Changjiang River basin were collected (SI, Figure S4). For the [DIN] observed at hydrological stations, the sampling frequency ranged from 2 to 3 times per month.…”

Section: Riverine Din Data Sourcesmentioning

confidence: 99%

Basin-scale control on N2O loss rate and emission in the Changjiang River network, China

Wang

Yan

et al. 2022

Front. Mar. Sci.

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Global riverine N2O emissions have been made by several studies with great uncertainty. However, the regional N2O budgets and patterns in large river networks is still unclear, due to the lacking understanding of in-river N2O emission rate and well-classified river network water areas. Furthermore, the mass ratio of N2O emission against nitrogen(N) load in river networks remains controversial. Here we report N2O emissions from the largest river of China, the Changjiang River network, emphasizing the basin-scale control on riverine N2O loss rate in response to increasing N loads and river size. We find the N2O emission rate is negatively related to Strahler river orders, and positively related to N loading. The velocity (Vf) of N conversion into N2O was 0.131-0.436 m yr-1, and N2O loss rate (ζ) was 0.27-37.64 ×10-4 d-1 and declined exponentially with water discharge. Both the loss rate and the mass ratio of N conversion into N2O varied significantly at basin scale, indicating the diminishing capacity of river ecosystems to convert excess DIN into N2O when N load increased as a direct result of human activities. Our study shows N2O emission was 0.66 Gg N2O-N (1Gg=109g) in 1986 and increased to 10.3 Gg N2O-N in 2014 for the whole Changjiang River network. We identified the headwater streams are hotspots of N2O emission across the headwater stream to the estuary aquatic continuum. N2O emission was about 0.82% - 5.31% of global riverine N2O budget during 2010-2014. Our study suggested that an integrated approach in view of the riverine N loads and river hydrology is needed to improve estimates of riverine N2O emissions.

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Spatial and Seasonal Patterns of Sediment Bacterial Communities in Large River Cascade Reservoirs: Drivers, Assembly Processes, and Co-occurrence Relationship

Yuan

Guo

et al. 2022

Microb Ecol

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Sources and Processes Affecting Nitrate in a Dam-Controlled Subtropical River, Southwest China

Cited by 14 publications

References 50 publications

Contribution of Nitrogen Sources to Streams in Mixed-use Watershed Varies Seasonally in a Temperate Region

Contribution of Nitrogen Sources to Streams in Mixed-use Watershed Varies Seasonally in a Temperate Region

Basin-scale control on N2O loss rate and emission in the Changjiang River network, China

Spatial and Seasonal Patterns of Sediment Bacterial Communities in Large River Cascade Reservoirs: Drivers, Assembly Processes, and Co-occurrence Relationship

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